Introduction: Among many user complaints, water tariff disputes account for about one-third. A large part of it is caused by measurement problems. In this type of dispute, the issue of measurement accuracy is the first issue, followed by the issue of weekly water meter inspection. According to regulations, industrial water meters must be periodically verified, and the verification period shall not exceed 2 years. The domestic water meter is only for the first verification, and the service life shall not exceed 6 years (the diameter of the water meter is 15-25mm) or 4 years (the diameter of the water meter is 25-50mm), and must be replaced when it expires. However, in the specific operation process, it is not easy to do all according to this regulation, which involves both financial issues and ordinary basic management. Inaccurate measurement leads to the occurrence of water quantity estimation. This is also a considerable economic loss for water supply companies and causes some social disputes.

Source: China Mercury

In the handling of user disputes, with the increase of one meter per household, a typical phenomenon of the water meter problem is that the rotation of the water meter leads to measurement disputes. It is also a case that has occurred in recent years, and the causes are more complicated.

The reasons for "rotation" are roughly as follows:

1. There are leaks in the internal pipe network behind the meter, and the leaks are relatively hidden and not easy to be found. The water meter counts normally and is easy to be mistaken for "rotation";

2. Leakage of internal water equipment or trace water replenishment, such as leaking toilet tank, loose faucet, water heater replenishment, etc.;

3. The water meter is too close to the water supply standpipe, and the water meter will be disturbed when the water pressure is unstable. According to the regulations, the water meter installation requires a certain straight pipe section before and after the meter according to the diameter of the water meter. However, the current installation position of the household meter is sometimes not satisfied According to this standard, the change of water pressure can easily cause interference to the water meter impeller, and the "rotation" caused by this reason is more common;

4. In the water environment of multi-storey buildings, individual users installed small pressurized water pumps on the pipelines without permission, which interfered with the water pressure environment of neighboring household meters, causing the neighboring household meters to "rotate"

5. When pressurized facilities are used for secondary water supply in high-rise buildings, the water flow in the pipeline changes greatly, the pressure is unstable, and the water meter is disturbed;

6. Bubbles enter the pipe during meter change or pipeline construction. When the pressure in the pipe and the external pressure change, the bubbles flow irregularly back and forth in the pipe. When the bubbles flow through the water meter, they break the balance of the impeller and cause the water meter to be busy. The needle swings back and forth or intermittently rotates;

7. The water meter itself is too sensitive due to the small hole in the water inlet box of the impeller, the downward impeller, and the dense holes of the water filter mesh; eighth, the water pressure in the pipeline is too high, the flow velocity is too fast, and the water meter cannot measure accurately. This situation is relatively rare.

In view of the "rotation" phenomenon of the water meter, the following measures are generally adopted:

1. First of all, you should understand the internal and external water supply environment, and understand the historical water consumption and payment records in advance, which will help you to judge your actual water consumption. Then check the internal pipeline layout to determine whether it is an independent closure, and also to inspect the internal water points.

2. Identification and inspection of leakage of internal pipelines and water facilities. Observe the water meter, if the busy needle keeps rotating at a constant speed for a period of time, it can be preliminarily judged that there is water leakage inside the user, and the amount of water leakage can be judged according to the rotation speed of the busy needle. Look for internal leaks. Toilets, water tanks, and water heaters are the key points of inspection. You can check by dripping ink in the water tank or dipping it with toilet paper; if there are no leaks, check the buried pipelines.

3. Analyze and process non-endoleak phenomena. Busy needle jitter, back and forth swing or intermittent slight rotation, mostly due to unstable water pressure, too close to the riser or air bubbles in the pipe, etc. This situation has little effect on measurement. In the case of air bubbles in the pipeline, the air bubbles in the pipeline can be eliminated by draining water. The location of the water meter does not meet the installation regulations, and the water meter will also be disturbed. According to the site space conditions, the pipeline can be modified and the distance between straight pipes can be extended. If the site does not have the transformation conditions, a one-way valve or anti-disturbance device can be installed. At present, the most common solution is to install check valves and exhaust valves.